H3C Technologies H3C SR8800 - Manual (Page 130)

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# Perform the display mpls te tunnel command on Router A. You can find that two tunnels are
present with the outgoing interface being GigabitEthernet 3/1/1 and POS 2/1/2 respectively.
This indicates that a backup CR-LSP was created upon creation of the primary CR-LSP.
[RouterA] display mpls te tunnel
LSP-Id Destination In/Out-If Name
1.1.1.9:6 3.3.3.9 -/GE3/1/1 Tunnel4
1.1.1.9:2054 3.3.3.9 -/POS2/1/2 Tunnel4
# Perform the display mpls te tunnel path command on Router A to identify the paths that the two
tunnels traverse:
[RouterA] display mpls te tunnel path
Tunnel Interface Name : Tunnel4
Lsp ID : 1.1.1.9 :6
Hop Information
Hop 0 10.1.1.1
Hop 1 10.1.1.2
Hop 2 2.2.2.9
Hop 3 20.1.1.1
Hop 4 20.1.1.2
Hop 5 3.3.3.9
Tunnel Interface Name : Tunnel4
Lsp ID : 1.1.1.9 :2054
Hop Information
Hop 0 30.1.1.1
Hop 1 30.1.1.2
Hop 2 4.4.4.9
Hop 3 40.1.1.1
Hop 4 40.1.1.2
Hop 5 3.3.3.9
# Perform the tracert command to draw the picture of the path that a packet must travel to reach
the tunnel destination.
[RouterA] tracert –a 1.1.1.9 3.3.3.9
traceroute to 3.3.3.9(3.3.3.9) 30 hops max,40 bytes packet
1 10.1.1.2 25 ms 30.1.1.2 25 ms 10.1.1.2 25 ms
2 40.1.1.2 45 ms 20.1.1.2 29 ms 40.1.1.2 54 ms
The sample output shows that the current LSP traverses Route B but not Router D.
# Shut down interface GigabitEthernet 3/1/2 on Router B. Perform the tracert command on Router
A to draw the path to the tunnel destination. You can see that the LSP is re-routed to traverse Router
D:
[RouterA] tracert –a 1.1.1.9 3.3.3.9
traceroute to 3.3.3.9(3.3.3.9) 30 hops max,40 bytes packet
1 30.1.1.2 28 ms 27 ms 23 ms
2 40.1.1.2 50 ms 50 ms 49 ms
# Perform the display mpls te tunnel command on Router A. You can find that only the tunnel
traversing Router D is present:
[RouterA] display mpls te tunnel
LSP-Id Destination In/Out-If Name
1.1.1.9:2054 3.3.3.9 -/POS2/1/2 Tunnel4